Dover OPW 790 Series Bedienungsanleitung

Worm Gear Hex Drive

www.opw-es.com

790 Series Counterbalance

790-SERIES-IOM-EN-11/2023

NOTE: Prior to any loading arm disassembly, spring tension should be

completely relieved. Tip: To relieve tension, arm should be pushed up as

much as possible and supported while spring tension is relieved. Spring

coil will be loose in housing when completely relieved of tension.

Equipment: Torsion Balance Type: 790X,A,B,C

Balance Unit for Balancing Loading Arms

Suitable for: Loading Arm Balancing

Easy, Precise Adjustment No special tools required

Specifications

Type: Right-Hand: 790X-0010 (Purple) 790A-0020 (White),

790B-0030 (Yellow), 790C-0050 (Red)

Left-Hand: 790XLH-0015 (Brown), 790ALH-0025 (Black),

790BLH-0035 (Gray), 790CLH-0045 (Orange)

Working Temperature Range:

-40°F to 176°F (-40°C to +80°C)

Installation

Spring Unit Assembly

1. Position balance unit on the bosses at back of swivel joint.

2. Fix balance unit with Bolts and Lock Washers.

3. Attach backside of Link Arm [17] to Spring Arm [15] with Pin

[16] and 2 Retaining Rings [14].

4. Remove the 4 Socket Head Screws [18] and take Snubber

Block [26] off.

5. Raise loading arm to highest position (as vertical as possible).

6. Attach front side of Link Arm [17] to mounting ears on loading arm

with Pin [16] and 2 Retaining Rings [14].

7. Check balancing action by pulling down the arm. If adjustment is

necessary, follow adjustment instructions below.

8. Install lock-down unit 788-L, if used, by following 788-L installation

instructions.

9. Replace Cover [21] using alignment pins [1] and latches [22].

Adjustment

When to adjust torque

A. To raise loading arm higher or for more lifting action INCREASE torque.

B. To decrease loading arm vertical travel or to slow the rate at which the arm rises, DECREASE torque.

C. Note: Prior to any disassembly, Spring balance tension should be completely relieved to allow safe disassembly of level arm.

Torque

For more lifting action increase torque.

For less lifting action decrease torque.

Place ¾"socket wrench on worm gear hex drive.

To INCREASE torque rotate the worm gear hex drive

counterclockwise (to the left).

To DECREASE torque rotate the worm gear hex drive

clockwise (to the right).

Easy-To-Use

Spring Cover Latch

Index Qty Part # Description

1 4 H-31396-M Spirol Pin, 1⁄4 x 13⁄4

2 1 C-20185-BW Spring Regulator, R.H. Worm Gear

3 1 H-30744-M Dowel Pin .25 x 1.25

4 2 H-01490-M Flange, Bearing, BRZ. 11⁄2" DIA x 11⁄4" LG

5 2 H-32283-M Retaining Ring, CST ZP

6 2 H-32282-M Bearing, Cylindrical, Bronze

7 1 H-30743-M Washer, Thrust, ZP, 7⁄8"

8 1 C-20184-EW Drive Worm, Torsion Spring

9 2 H-30741-M Screw, Drive #10 x 3⁄8"

10 1 H-30740-M Worm Cover Plate, Spring Balance

11 1 H-30018-M Bolt, 1⁄2"-13 x 31⁄2

12 1 Jam Nut, Hex, CST, ZP, 1⁄2"-13

13 1

H-30049-M

E20074D1 790 Support Bracket, D1

14 2 H-30321-M Retaining Ring, CST, 5⁄8"

15 1 D-00350-D1 Spring Arm, PTD, D1

16 1 H-30320-RE Pin, Torsion Spring, SST

Index Qty Part # Description

17** 1 E-20041-D1 Link Arm, D1

18 4 H-31278-M Socket Head Screw, ZP, .31-18 X 1"

19 2 H-02507-M Lockwasher, CP, 5⁄8"

20 2 Screw, Hex Cap, CST, ZP, 5⁄8"-11 x 13⁄4"

21 1 790 Spring Balance Cover, RH

22 2 Spring Cover Latch (SouthCo)

23 4

H-05910-M

E20181

H32321M

H32322M Screw, Thread Forming, 8-32

24 1 C-00626-M Spring, Torsion, C

25 1 H-30742-RS Bar, Safety

26 1 H-01489-D1 Snubber Block, RH, D1

27 4 H-03563-M Washer, Lock, ZP, 5⁄16"

28 1 H-01486-RB Snubber Retainer, Brass, 11⁄8-12 x 1⁄2"

29 1 H-01487-RE Snubber Plunger, SST, 15⁄16" DIA x 19⁄16" LG

30 1 Spring, Compression, ZP

31 1

H-01502-M

C00635D1 Support, RH Side, D1

790 Series Counterbalance

www.opw-es.com

Parts List: 790 Series Counterbalance*

*790C (Right-Hand) shown in image. Spring Coil (24) would change depending on model.

** For 790A Units, Link Arm (17) would be C00636DI.

For 790X Units, Link Arm (17) would be C00636DI-Mod (Temporary), C22871M

Jam Nut

Stop

Pivot Pin

Snubber

790 Series Counterbalance

www.opw-es.com

Travel Stop

Upward

Remove the (4) socket head screws in snubber

block, then rotate snubber block toward pivot

pin to allow for more upward travel or away

from pivot pin for less upward travel.

Replace the (4) screws and tighten.

Downward

Loosen Jam Nut (located below lever arm) and

turn stop bolt in for more downward travel or

out for less downward travel. Then hold bolt

and tighten jam nut securely.

Maintenance 790 Series

Lubrication

The torsion balance is provided with a self-lubricating Cylindrical Bearing. Only when operating

under severe conditions, a little oil may be applied to Bearing [7]. Pins [13] on Spring Arm [23]

and Link Arm [9] should have some oil quarterly.

DANGER Danger! Before performing any maintenance, always secure the Loading Arm and remove all tension from the counterbalance

-- a torsion spring. The Loading Arm counterbalance spring contains a substantial amount of stored energy. You must relieve

this energy before any disassembly. Failure to remove all tension from the counterbalance spring of the Loading Arm before

maintenance may cause serious personal injury or death.

WARNING and steel-toed work boots. Failure to wear adequate personal protection may cause serious personal injury or death.

WARNING! While installing and using the Loading Arm, always wear adequate personal protection, including hard hats, gloves,

WARNING WARNING! Always follow the procedures prescribed in this Document. Failing to follow the procedures prescribed may damage

the Loading Arm and cause serious personal injury or death. Consult Loading Arm Installation, Maintenance & Safety Manual for

more details.

www.opw-es.com

9393 Princeton-Glendale Road

Hamilton, Ohio, USA 45011

|Phone: (800) 547-9393

wholly-owned subsidiary of Dover Corporation.

34 5

1231

19202122

790 Series Counterbalance

www.opw-es.com

Parts List: 788, 789 Series Counterbalance

No. Part No. Part

1Torsion Spring 13 Snubber Block

2Spring Regulator 14 Lock Washer

3 Bolt 15 Bolt

4Lock Washer 16 Bolt

5Spring Keeper

17 Nut

6Spring Arm 18 Screw

7 Lever 19 Cover (NOT SHOWN)

8 E-ring 20 Spring Compression

8 Pin 21 Snubber Retainer

10 Support Bracket 22 Snubber Plunger

11 Bearing Flange 23 E-ring

12 Side Support 24 Pin

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